设计模式 之 外观模式
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2022-05-17 19:40:00
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下载 23种设计模式源码 :http://download.csdn.net/download/knight_black_bob/8936043
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创建型模式,共五种:
工厂方法模式 抽象工厂模式 单例模式 建造者模式 原型模式
结构型模式,共七种:
适配器模式 装饰器模式 代理模式 外观模式 桥接模式 组合模式 享元模式
行为型模式,共十一种:
策略模式 模板方法模式 观察者模式 迭代子模式 责任链模式 命令模式
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package 设计模式.外观模式; public class Product { private String name; private double price; private int count; public Product(){} public Product(String name){ this.name = name; } public Product(String name, double price, int count) { this.name = name; this.price = price; this.count = count; } public int getCount() { return count; } public void setCount(int count) { this.count = count; } public String getName() { return name; } public void setName(String name) { this.name = name; } public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } @Override public boolean equals(Object obj) { if (obj != null) if (obj instanceof Product) return this.name == ((Product) obj).getName(); return false; } @Override public String toString() { StringBuffer sb =new StringBuffer(); sb.append(getClass().getName().substring(getClass().getName().lastIndexOf(".")+1,getClass().getName().length())); sb.append("["); sb.append("\"name\":\""+name+"\","); sb.append("\"count\":"+count+","); sb.append("\"price\":"+price); sb.append("]"); return sb.toString(); } }
package 设计模式.外观模式; import java.util.ArrayList; import java.util.List; public class Shop { static List<Product> plist = new ArrayList<Product>(); static { Product apple = new Product("apple",2.5,200); Product pear = new Product("pear",1.0,200); plist.add(apple); plist.add(pear); } public double getProPrice(String name){ Product pro =null; for (Product p : plist) { if (p.equals(new Product(name)) == true) { pro =p; break; } } if (pro !=null) return pro.getPrice(); else return 0.0; } public boolean rebuy(String name ,int count ){ boolean flag =false; Product pro =null; for (Product p : plist) { flag = flag | p.equals(new Product(name)); if (flag == true) { pro =p; break; } } if (flag == true && pro !=null) if (pro.getCount() >= count) flag = true; else flag = false; else flag =false; return flag; } public boolean buy(String name ,int count ){ boolean flag =false; Product pro =null; for (Product p : plist) { flag = flag | p.equals(new Product(name)); if (flag == true) { pro =p; break; } } plist.remove(pro); pro.setCount(pro.getCount()-count); plist.add(pro); return flag; } public List<Product> getList(){ return plist; } }
package 设计模式.外观模式; public class Wallet { static double money = 10000.00; public boolean check(double price){ boolean flag =false; if (money > price ){ flag = true; }else flag =false; return flag; } public boolean pay(double price){ boolean flag =false; if (money > price ){ money -= price; flag = true; }else flag =false; return flag; } public double balance(){ return money; } }
package 设计模式.外观模式; import java.util.ArrayList; import java.util.List; public class Order { static List<Product> plist = new ArrayList<Product>(); public boolean addOrder(Product p){ plist.add(p); return true; } public boolean addOrder(String name, double price, int count){ Product p = new Product ( name ,price ,count) ; return this.addOrder(p); } public List<Product> getOrderList(){ return plist; } }
package 设计模式.外观模式; import java.util.List; public class Pay { Shop shop = new Shop(); Wallet mWallet = new Wallet(); Order order= new Order(); public boolean doPay(String name ,int count){ boolean flag = false; flag = flag | shop.rebuy(name, count); if (flag == false) return flag; flag = flag & mWallet.check(shop.getProPrice(name) * count); if (flag == false) return flag; flag = flag &shop.buy(name, count); if (flag == false) return flag; flag = flag &mWallet.pay(shop.getProPrice(name) * count); if (flag == false) return flag; flag = flag & order.addOrder(name, shop.getProPrice(name) * count, count); return flag; } public double balance(){ return mWallet.balance(); } public String myOrder(){ StringBuffer sb = new StringBuffer(); sb.append("{"); List<Product> list = order.getOrderList(); for (int i = 0; i < list.size(); i++) { Product p = list.get(i); sb.append("[\"name\":\""+p.getName()+"\""); sb.append("\"price\":\""+p.getPrice()+"\""); sb.append("\"count\":\""+p.getCount()+"\"],"); if (i == list.size()-1) sb = sb.replace(sb.length()-1, sb.length(), ""); } sb.append("}"); return sb.toString(); } public String productList(){ StringBuffer sb = new StringBuffer(); sb.append("{"); List<Product> list = shop.getList(); for (int i = 0; i < list.size(); i++) { Product p = list.get(i); sb.append("[\"name\":\""+p.getName()+"\""); sb.append("\"price\":\""+p.getPrice()+"\""); sb.append("\"count\":\""+p.getCount()+"\"],"); if (i == list.size()-1) sb = sb.replace(sb.length()-1, sb.length(), ""); } sb.append("}"); return sb.toString(); } }
package 设计模式.外观模式; public class FacadeTest { //简化外部客户程序和系统间的交互接口 //为子系统中的一组接口提供一个一致的界面,Facade模式定义了一个高层接口,这个接口使得这一子系统更加容易使用。[GOF 《设计模式》] public static void main(String[] args) { Pay pay = new Pay(); System.out.println("余额:" +pay.balance()); System.out.println("商品信息:" +pay.productList()); System.out.println("我的购物车:" +pay.myOrder()); System.out.println("支付是否成功:" + pay.doPay("apple", 2)); System.out.println("支付是否成功:" + pay.doPay("apple", 200000)); System.out.println("支付是否成功:" + pay.doPay("banana", 2)); System.out.println("余额:" +pay.balance()); System.out.println("商品信息:" +pay.productList()); System.out.println("我的购物车:" +pay.myOrder()); } }
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